Professional Tools
Electrical Calculators
Professional-grade voltage drop calculators for every application. Our tools follow NEC 2023 standards and use resistance values from Chapter 9 Table 8.
Full-Featured Calculators
AC Voltage Drop Calculator
Professional AC calculator with NEC Table 9 values, power factor, and conduit types.
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DC Voltage Drop Calculator
Calculate voltage drop for DC circuits including solar PV and battery systems.
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Wire Size Calculator
Determine the optimal wire size for your application based on load requirements.
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DC Systems
AC Systems
Quick Wire Sizing Reference
| Wire Size | Copper Ampacity | Aluminum Ampacity | Typical Use |
|---|---|---|---|
| 14 AWG | 15A | - | Lighting circuits |
| 12 AWG | 20A | 15A | General purpose outlets |
| 10 AWG | 30A | 25A | Dryers, water heaters |
| 8 AWG | 40A | 30A | Ranges, EV chargers |
| 6 AWG | 55A | 40A | Large appliances, subpanels |
* Ampacity values based on NEC Table 310.16 at 60°C rating. Always verify with current NEC tables.
Additional Resources
References & Standards
- NFPA 70 - National Electrical Code (NEC) - Official NEC standards from NFPA
- Copper Development Association - Copper wire specifications and properties
- Aluminum Association - Aluminum conductor information
- IEEE Standards - Electrical engineering standards